时间大盗：用ac -d查看用户每天在线时长，居然高于24小时

ac是linux下很有意思的命令，可以统计用户的在线时长

按man ac的解释

AC(1)                                        General Commands Manual                                       AC(1)NAMEac -  print statistics about users' connect timeSYNOPSISac     [ -d | --daily-totals ] [ -y | --print-year ][ -p | --individual-totals ] [ people ][ -f | --file filename ] [ -a | --all-days ][ --complain ] [ --reboots ] [ --supplants ][ --timewarps ] [ --compatibility ][ --tw-leniency num ] [ --tw-suspicious num ][ -z | --print-zeros ] [ --debug ][ -V | --version ] [ -h | --help ]DESCRIPTIONac  prints  out a report of connect time (in hours) based on the logins/logouts in the current wtmp file.A total is also printed out.The accounting file wtmp is maintained by init(8) and login(1).  Neither ac nor login creates the wtmp ifit doesn't exist, no accounting is done.  To begin accounting, create the file with a length of zero.NOTE:  The wtmp file can get really big, really fast.  You might want to trim it every once and a while.GNU ac works nearly the same UNIX ac, though it's a little smarter in several ways.  You should thereforeexpect differences in the output of GNU ac and the output of ac's on other systems.  Use the command infoaccounting to get additional information.OPTIONS-d, --daily-totalsPrint totals for each day rather than just one big total at the end.  The output looks like this:Jul  3  total     1.17Jul  4  total     2.10Jul  5  total     8.23Jul  6  total     2.10Jul  7  total     0.30-p, --individual-totalsPrint  time  totals  for  each user in addition to the usual everything-lumped-into-one value.  Itlooks like:bob       8.06goff      0.60maley     7.37root      0.12total    16.15people Print out the sum total of the connect time used by all of the users  included  in  people.   Notethat people is a space separated list of valid user names; wildcards are not allowed.-f, --file filenameRead from the file filename instead of the system's wtmp file.--complainWhen  the  wtmp file has a problem (a time-warp, missing record, or whatever), print out an appro‐priate error.--rebootsReboot records are NOT written at the time of a reboot, but when the system  restarts;  therefore,it  is  impossible  to know exactly when the reboot occurred.  Users may have been logged into thesystem at the time of the reboot, and many ac's automatically count the time between the login andthe  reboot  record  against  the user (even though all of that time shouldn't be, perhaps, if thesystem is down for a long time, for instance).  If you want to count this time, include the  flag.*For vanilla ac compatibility, include this flag.*--supplantsSometimes,  a logout record is not written for a specific terminal, so the time that the last useraccrued cannot be calculated.  If you want to include the time from the user's login to  the  nextlogin  on the terminal (though probably incorrect), include this you want to include the time fromthe user's login to the next login on the terminal (though probably incorrect), include this flag.*For vanilla ac compatibility, include this flag.*--timewarpsSometimes,  entries  in  a  wtmp file will suddenly jump back into the past without a clock changerecord occurring.  It is impossible to know how long a user was logged in when  this  occurs.   Ifyou  want  to  count  the  time between the login and the time warp against the user, include thisflag.  *For vanilla ac compatibility, include this flag.*--compatibilityThis is shorthand for typing out the three above options.-a, --all-daysIf we're printing daily totals, print a record for every day instead of skipping intervening  dayswhere  there  is no login activity.  Without this flag, time accrued during those intervening daysgets listed under the next day where there is login activity.--tw-leniency numSet the time warp leniency to num seconds.  Records in wtmp files might be slightly out  of  order(most  notably  when  two  logins  occur  within a one-second period - the second one gets writtenfirst).  By default, this value is set to 60.  If the program notices this problem,  time  is  notassigned to users unless the --timewarps flag is used.--tw-suspicious numSet  the  time  warp suspicious value to num seconds.  If two records in the wtmp file are fartherthan this number of seconds apart, there is a problem with the wtmp file (or your  machine  hasn'tbeen  used  in a year).  If the program notices this problem, time is not assigned to users unlessthe --timewarps flag is used.-y, --print-yearPrint year when displaying dates.-z, --print-zerosIf a total for any category (save the grand total) is zero, print it.  The default is to  suppressprinting.--debugPrint verbose internal information.-V, --versionPrint the version number of ac to standard output and quit.-h, --helpPrints the usage string and default locations of system files to standard output and exits.
FILESwtmpThe system wide login record file. See wtmp(5) for further details.
AUTHORThe  GNU  accounting utilities were written by Noel Cragg <noel@gnu.ai.mit.edu>. The man page was adaptedfrom the accounting texinfo page by Susan Kleinmann <sgk@sgk.tiac.net>.
SEE ALSOlogin(1), wtmp(5), init(8), sa(8)

ac prints out a report of connect time (in hours) based on the logins/logouts in the current wtmp file.

他的时间都是按小时计算的

常用的操作有

（1）-p：显示每个用户的连接时间
（2）-d：显示每天的连接时间
（3）-y：显示年份，可-d配合使用

还可在后面接用户名，比如

ac -d wa**ing

就是按天打印wa**ing的在线时长

但是我实际用的结果是

root@zhanglei:/# ac -d wa**ing
Jan  2  total        5.15
Jan  3  total        1.79
Jan  4  total       13.59
Jan  5  total       17.14
Jan  6  total        6.04
Jan  7  total        3.21
Jan 12  total        0.04
Jan 13  total        0.13
Jan 14  total        5.46
Jan 18  total        7.21
Jan 19  total       12.24
Jan 21  total        0.00
Jan 22  total       10.21
Jan 23  total       24.00
Jan 24  total       24.61
Jan 25  total       24.37
Jan 26  total       29.11
Jan 27  total       33.44
Today   total        3.14

最后几行居然大于24

众所周知，一天24小时。。。难道wa**ing就是传说中的时间大盗？？

在ac -d 不加用户名的时候，我发现

很多都大于了24小时

Jan 23   total       43.46
Jan 24  total       79.01
Jan 25  total      186.64
Jan 26  total      146.27
Jan 27  total      145.32
Today   total       15.76

猜测大于24小时的原因是，具体的时间，是按照用户在线进程统计的

比如一个用户同时有三个ssh通信连接服务器，那ac统计的时间是3*在线时间

从来就没有什么时间大盗，每个人一天都是24小时，一定要珍惜时间呀！！

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时间大盗：用ac -d查看用户每天在线时长，居然高于24小时

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